DCDC converter energy storage circuit, DCDC cabinet and energy storage system

Abstract

The utility model relates to the technical field of DCDC converters, and discloses an energy storage circuit of a DCDC converter, which comprises a bidirectional DC / DC conversion module and a DC bus, the bidirectional DC / DC conversion module mainly comprises a main circuit, a driving module and a control module, a DC module control unit receives a control instruction through a communication interface, and the DC bus is connected with the main circuit. The control unit of the bidirectional DC / DC conversion module is in 485 communication with control ends such as an EMS or a display screen. The utility model has the advantages of accurate voltage matching, efficient energy conversion, stable current output, strong protection function, prolonged service life of the battery, improved reliability of the system, adaptation to various battery types, remote monitoring and management, and the like. Through the advantages, the overall performance of the system is improved, the service life of the battery is prolonged, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to DCDC converter technical field especially relates to a DCDC converter energy storage circuit, DCDC cabinet and energy storage system. BACKGROUND

[0002] The basic working principle of DCDC converter is to change the pulse width or frequency of input voltage by controlling the conduction and shutdown of switching devices, so as to realize the increase or decrease of voltage. At present, DCDC converter is advancing towards integration, intelligentization, new materials and other directions.

[0003] The battery on the traditional industrial and commercial energy storage can only increase or decrease the number of battery PACK in order to adapt to the opening voltage of PCS (energy storage converter), and if the industrial and commercial energy storage is matched with photovoltaic or wind power energy storage, the DCDC converter can also provide maximum efficiency tracking and be used as an MPPT module. Therefore, the present application provides a DCDC converter energy storage circuit, DCDC cabinet and energy storage system to solve the problems raised in the above background technology. SUMMARY

[0004] The utility model discloses a DCDC converter energy storage circuit, DCDC cabinet and energy storage system are provided to solve the shortcomings in the prior art, which has accurate voltage matching, efficient energy conversion, stable current output, powerful protection function, prolonging battery life and improving system reliability.

[0005] To achieve the above object, the utility model provides the following technical scheme: a DCDC converter energy storage circuit, comprising a bidirectional DC / DC conversion module and a DC bus, the main components of the bidirectional DC / DC conversion module have a main circuit, a drive module and a control module, the DC module control unit receives control instructions through a communication interface, and the control unit of the bidirectional DC / DC conversion module communicates with the control end of EMS or display screen through 485.

[0006] Further, the control unit of the bidirectional DC / DC conversion module adopts a three-level topology structure, and the control unit of the bidirectional DC / DC conversion module supports MPPT mode access to photovoltaic panels.

[0007] Further, the DCDC module is hung on the DC bus, and the DCDC module can also be used as an MPPT module to access photovoltaic PV side.

[0008] Further, a DCDC cabinet and energy storage system, comprising an isolation transformer and a battery, the system is composed of an isolation transformer and an STS, a DC / DC, an MPPT, a battery, an EMS, a PCS, and a PV assembly, the battery pack is connected to the PCS device, the PCS device is connected to the load through the connection isolation transformer, and the STS is connected between the load and the power grid.

[0009] Further, the system is equipped with four 50KW-DCDC modules, and the DCDC cabinet adopts a modular design.

[0010] Further, QF1 is a high-voltage side DC circuit breaker 630A, QF2 is a low-voltage side DC circuit breaker 630A, and the DCDC cabinet adopts a modular design.

[0011] Further, the PCS device communicates with the EMS through an RS485 interface, and the EMS communicates with the PCS, the BMS, the DC / DC, and the smart meter through an RS485 interface.

[0012] The utility model has the following beneficial effects:

[0013] 1. The DCDC converter energy storage circuit, DCDC cabinet and energy storage system provided by the utility model can accurately convert the input voltage into the charging voltage required by the battery in the DCDC module in the DCDC cabinet and the light storage all-in-one machine, ensure that the battery is charged in the best state, and avoid overcharging or undercharging.

[0014] 2. The DCDC converter energy storage circuit, DCDC cabinet and energy storage system provided by the utility model support a wide range of input voltages and can adapt to different types of power input, such as solar panels, wind turbines, and power grids.

[0015] 3. The DCDC converter energy storage circuit, DCDC cabinet and energy storage system provided by the utility model can achieve an energy conversion efficiency of up to 99% or more, reduce energy loss, and improve the overall energy efficiency of the system.

[0016] 4. The DCDC converter energy storage circuit, DCDC cabinet and energy storage system provided by the utility model can provide a stable constant-current charging mode to ensure that the current remains constant during the charging process of the battery and avoid damage to the battery caused by current fluctuations.

[0017] 5. The DCDC converter energy storage circuit, DCDC cabinet and energy storage system provided by the utility model support multi-stage charging strategies, such as constant-current charging, constant-voltage charging, and floating charging, to ensure that the battery can achieve the best charging effect in each charging stage.

[0018] 6, The utility model provides a kind of DCDC converter energy storage circuit, DCDC cabinet and energy storage system, multiple protection: it has overvoltage, undervoltage, overcurrent, short circuit, overheat and multiple protection functions, ensure that battery is not damaged under abnormal condition. Battery management system integration: it can be integrated with battery management system (BMS), real-time monitoring battery state, provide more accurate protection and management. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is DCDCD converter system topological diagram of the utility model;

[0020] Figure 2 It is light storage integrated machine main system schematic diagram of the utility model;

[0021] Figure 3 It is light storage integrated system schematic diagram of the utility model that light storage integrated machine is built;

[0022] Figure 4 It is DCDC cabinet system schematic diagram of the utility model.

[0023] LEGEND: DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Referring to Figure 1 And Figure 2 An embodiment provided by the utility model: a kind of DCDC converter energy storage circuit, including bidirectional DC / DC conversion module and direct current bus, the main components of the bidirectional DC / DC conversion module have main circuit, drive module, control module, the control unit of the DC module receives control instruction by communication interface, the control unit of the bidirectional DC / DC conversion module and EMS or display screen etc. Control end carries out 485 communication, the control unit of the bidirectional DC / DC conversion module adopts three-level topological structure, the control unit of the bidirectional DC / DC conversion module supports MPPT mode access photovoltaic panel, DCDC module is hung on the direct current bus, the DCDC module can also be as MPPT module and access photovoltaic PV side;

[0026] Specifically, the DC module control unit receives the control instruction through the communication interface, which is conducive to the boost / drop processing of the input voltage and the output of a certain size of voltage; the control unit of the bidirectional DC / DC conversion module communicates with the EMS or the display screen and other control ends through 485, which is conducive to receiving the instruction issued by the EMS and realizing the purpose of voltage rise / drop; the three-level topology structure is adopted, which is conducive to making the system have higher efficiency, smaller size and smaller EMI interference, etc., and supporting the MPPT mode to access the photovoltaic panel to realize maximum power tracking or access AC / DC to supply power to the load; the DCDC module is used as the MPPT module to access the photovoltaic PV side, which is conducive to obtaining the maximum efficiency point tracking.

[0027] Referring to Figure 3 and Figure 4 A DCDC cabinet and energy storage system, comprising an isolation transformer and a battery, the system is composed of an isolation transformer and an STS, a DC / DC, an MPPT, a battery, an EMS, a PCS, and a PV assembly, the battery pack is connected to the PCS device, the PCS device is connected to the load through the connection isolation transformer, the STS is connected between the load and the power grid, the system is equipped with four 50KW-DCDC modules, the DCDC cabinet adopts modular design, QF1 is a high-voltage side DC circuit breaker 630A, QF2 is a low-voltage side DC circuit breaker 630A, the DCDC cabinet adopts modular design, the PCS device communicates with the EMS through the RS485 interface, and the EMS communicates with the PCS, the BMS, the DC / DC, and the smart meter through the RS485 interface;

[0028] Specifically, the STS is connected between the load and the power grid, which is conducive to the cooperative action with the PCS to realize fast on-off grid switching and the load will not be powered off; the PCS device communicates with the EMS through the RS485 interface, which is conducive to indirectly realizing the battery pack charge and discharge control; the EMS communicates with the PCS, the BMS, the DC / DC, and the smart meter through the RS485 interface, which is conducive to realizing the energy scheduling of the light storage system; the DCDC cabinet adopts modular design, which is conducive to increasing or reducing the number of modules in the DCDC cabinet according to the battery voltage and capacity, and can also be flexibly configured and expanded according to actual needs, facilitating system upgrade and maintenance, multi-output, supporting multiple independent outputs, and can simultaneously power multiple devices to meet the voltage and current requirements of different devices;

[0029] Working principle: two-way DC / DC conversion module, by using electronic switch to adjust the form and size of input voltage, to achieve the purpose of generating the required voltage, DC module control unit receives control instructions through the communication interface, the input voltage is processed by rising / falling, output a certain size of voltage, EMS through RS485 interface and PCS, BMS, DC / DC and smart meter communication, conducive to the realization of energy scheduling of light storage system, DCDC cabinet can increase or decrease the number of modules in DCDC cabinet according to the battery voltage and capacity, DCDC cabinet adopts modular design, can be flexibly configured and expanded according to the actual demand, convenient for system upgrade and maintenance, DCDC cabinet can provide stable output voltage, even if the input voltage fluctuation is large, also can guarantee the stability of output voltage, suitable for the equipment with strict voltage requirement, in addition, multi-stage regulation, through the multi-stage regulation function, DCDC cabinet can dynamically adjust the output voltage according to the load demand, ensure the equipment runs in the best working condition.

[0030] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A DCDC converter energy storage circuit comprising a bidirectional DC / DC conversion module and a DC bus, characterized in that: The main components of the bidirectional DC / DC conversion module include a main circuit, a driving module, a control module and a DC module, the DC module control unit receives control instructions through a communication interface, and the control unit of the bidirectional DC / DC conversion module communicates with a control end of an EMS or a display screen through 485 communication.

2. A DCDC converter energy storage circuit according to claim 1, characterized in that: The control unit of the bidirectional DC / DC conversion module adopts a three-level topology structure, and the control unit of the bidirectional DC / DC conversion module supports MPPT mode access to a photovoltaic panel.

3. A DCDC converter energy storage circuit according to claim 1, characterized by: The DCDC module is hung on the DC bus, and the DCDC module can also be used as an MPPT module to access the photovoltaic PV side.

4. A DCDC cabinet and energy storage system comprising an isolation transformer and a battery, characterized in that: The system is composed of an isolation transformer, an STS, a DC / DC, an MPPT, a battery, an EMS, a PCS and a PV assembly, the battery is connected to the PCS device, the PCS device is connected to a load through the isolation transformer, and the STS is connected between the load and a power grid.

5. A DCDC cabinet and energy storage system according to claim 4, characterised in that: The system is equipped with four 50KW-DCDC modules, and the DCDC cabinet adopts a modular design.

6. A DCDC cabinet and energy storage system according to claim 4, characterized in that: QF1 is a high-voltage side DC circuit breaker 630A, and QF2 is a low-voltage side DC circuit breaker 630A, and the DCDC cabinet adopts a modular design.

7. A DCDC cabinet and energy storage system according to claim 4, characterized in that: The PCS device communicates with the EMS through an RS485 interface, and the EMS communicates with the PCS, a BMS, a DC / DC and a smart meter through an RS485 interface.

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